After installing Symantec Endpoint Protection (SEP) 14.3 RU2 or 14.3 RU3 Windows 2012 R2 servers hang at random times.
Rare deadlock that can be encountered by the Auto-Protect driver
This issue is fixed in Symantec Endpoint Protection 14.3 RU4 and 14.3 RU2 P2. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec software here.
If upgrading is not an option at this time the following workaround can be implemented:
1. Open Regedit
2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Symantec\Symantec Endpoint Protection\AV\Storages\Filesystem\RealTimeScan
3. Create a new DWORD and name it volume_protection
4. Set value to 0
This change will take effect immediately and does not require a service restart.